do not worry about the baggage issue!I was quite worried about this since we were 4 people going on vaca for 2 weeks!We had 2 large suitcases on wheels and 2 smaller suitcases.We also had 2 tote bags we carried.I had each child pull the small suitcases onto the train and my hubby and I handled the bigger ones.Your friend will have the baby to carry so she needs to plan around that.There are esculators to get down to the trains and you need to get your family and luggage onto them yourself(unless you want to pay a 'redcap').We had a small crisis at the top of the 1st one when I panicked because I was heading down first with the big suitcase and my little 4 year old was behind me and I couldn't hold onto her.She was scared and had never been on one.I froze at the top and jumped off(holding up the mass of people rushing at us

and the attendant at the top said to take my child down and she would put the suitcases on behind me-which she did.Small panic for a second!!As for the no checked bags rule-that is correct-somewhat!The trains heading into Penn do not check bags-you are on your own for all items.They have an area in the back of most cars that has large open area and that is where people stack their luggage and stroller and such.We put our pile there and sat nearby.Once we arrived at Penn we loaded up and headed onto the next train where we had our luggage with us in our rooms.